asyncpg + aiogram. cannot perform operation: another operation is in progress - python-3.x

Question

How I can fix it? I played with it a lot and for a long time, but nothing came of it.
sql_db.py:
import asyncio
import asyncpg
LOG_PG = {"database": 'test_bot',
"user": 'misha',
"password": '1234',
"host": 'localhost'}
class Database:
SELECT_USER_LANG = "SELECT lang FROM lang_set WHERE user_id = $1 AND bot_token = $2"
def __init__(self, loop: asyncio.AbstractEventLoop):
self.pool = loop.run_until_complete(
asyncpg.create_pool(**LOG_PG)
)
async def get_lang(self, user_id, token):
search_d = [user_id, token]
res = await self.pool.fetchval(self.SELECT_USER_LANG, *search_d)
if res is None:
return "ru"
return res
I tried to insert this loop everywhere, run without it, multiple combinations in the code itself. But nothing changed. I do not know how to describe the problem in more detail
main.py:
from aiogram import Bot, Dispatcher
from aiogram.types import Message
import asyncio
from sql_db import Database
loop = asyncio.get_event_loop()
token = "TOKEN"
dp = Dispatcher()
bot = Bot(token=token, parse_mode="HTML")
db = Database(loop)
async def echo_msg(message: Message):
user_id = message.from_user.id
await message.send_copy(user_id)
await db.get_lang(user_id, token)
dp.message.register(callback=echo_msg)
if __name__ == '__main__':
dp.run_polling(bot, skip_updates=True)
error:
...
File "/home/mickey/Desktop/chat_admin/venv/lib/python3.8/site-packages/asyncpg/pool.py", line 867, in release
return await asyncio.shield(ch.release(timeout))
File "/home/mickey/Desktop/chat_admin/venv/lib/python3.8/site-packages/asyncpg/pool.py", line 224, in release
raise ex
File "/home/mickey/Desktop/chat_admin/venv/lib/python3.8/site-packages/asyncpg/pool.py", line 214, in release
await self._con.reset(timeout=budget)
File "/home/mickey/Desktop/chat_admin/venv/lib/python3.8/site-packages/asyncpg/connection.py", line 1367, in reset
await self.execute(reset_query, timeout=timeout)
File "/home/mickey/Desktop/chat_admin/venv/lib/python3.8/site-packages/asyncpg/connection.py", line 318, in execute
return await self._protocol.query(query, timeout)
File "asyncpg/protocol/protocol.pyx", line 323, in query
File "asyncpg/protocol/protocol.pyx", line 707, in asyncpg.protocol.protocol.BaseProtocol._check_state
asyncpg.exceptions._base.InterfaceError: cannot perform operation: another operation is in progress

Answer 1

Works through such a launch. It must be turned on through the aiogram. I do not know how to formulate, but I was lucky to understand the problem
...
data_ = {}
class Database:
def __init__(self, pool: asyncpg.create_pool):
self.pool = pool
async def get_lang(self, user_id, token):
search_d = [user_id, token]
async with self.pool.acquire() as conn:
res = await conn.fetchval(SELECT_USER_LANG, *search_d)
if res is None:
return "ru"
return res
async def create_pool():
pool = await asyncpg.create_pool(**LOG_PG)
data_["db"] = Database(pool)
async def echo_msg(message: Message):
user_id = message.from_user.id
await message.send_copy(user_id)
await data_["db"].get_lang(user_id, token)
dp.message.register(callback=echo_msg)
if __name__ == '__main__':
dp.startup.register(create_pool) # ANSWER
dp.run_polling(bot, skip_updates=True)